red circle will not disappear
Definition and Usage
The onclick event occurs when the user clicks on an element.
Technical Details
Bubbles: Yes
Cancelable: Yes
Event type: MouseEvent
Supported HTML tags: All HTML elements, EXCEPT: , , , , , , , , , , and
DOM Version: Level 2 Events
<head>
<title>Javascript</title>
<style type="text/css">
.circle {
width: 120px;
height: 120px;
border-radius:50%;
float:left;
margin-right:50px;
}
#red-circle {
background-color: red;
}
#blue-circle {
background-color: blue;
}
#yellow-circle {
background-color: yellow;
}
</style>
</head>
<body>
<div class="circle" id="red-circle"></div>
<div class="circle" id="blue-circle"></div>
<div class="circle" id="yellow-circle"></div>
<script type="text/javascript">
documnet.getElementById("red-circle").onclick = function() {
document.getElementById("red-circle").style.display = "none";
}
</script>
</body>
You have a typo:
documnet.getElementById("red-circle").onclick = function() {
documnet instead of document. Just run it and check console.
Related
The following script is creating a grid of 16 divs. Per mouseover effect I would like to change the color of the divs permanently. Can somebody give me a pointer how what function changeColor could look like?
<script>
let gridcontainer = document.querySelector('#gridcontainer');
gridcontainer.setAttribute('style', 'width: 20px; display: grid; grid-template-columns: auto auto auto auto;')
var index = [];
var boxes;
var i;
var change;
function createGrid(){
for(i=0;i<16;i++){
//console.log(index);
boxes = document.createElement('div');
console.log(boxes);
boxes.classList.add('boxes');
boxes.setAttribute('style','width: 30px; height:30px; background-color:
blue; margin: 5px;');
boxes.setAttribute('onmouseover', changeColor());
gridcontainer.appendChild(boxes);
}}
function changeColor(){
change = document.querySelector('.boxes');
change.setAttribute('style','background-color: red');
}
</script>
Thank you all for your help.
I have used jquery function (toggleClass) to change the color div on hover
<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<style type="text/css">
.b1{
background:red;
width: 30px;
height: 40px;
margin: 10px;
}
.b{
background:blue;
width: 30px;
height: 40px;
margin: 10px;
}
</style>
</head>
<body>
<div class="b1"></div>
<div class="b1"></div>
<div class="b1"></div>
<div class="b1"></div>
<div class="b1"></div>
<script type="text/javascript">
$('div').hover(function () {
// body...
$("div").toggleClass("b");
});
</script>
</body>
</html>
How to prevent a user from removing <section> inside <div contenteditable> editor during editing (at least by pressing "Delete"/"Backspace" keys)?
<html>
<head>
<title>Parcel Sandbox</title>
<meta charset="UTF-8" />
<style>
#editor {
width: 100%;
height: 300px;
border: 1px black solid;
}
#dont-remove-me-please{
width: 100%;
height: 100px;
border: 1px red dashed;
font-weight: bold;
user-select: none;
}
</style>
</head>
<body>
<div id="app"></div>
<div contenteditable="true" id="editor">
<div>hey guys!</div>
<div><strong>more text...</strong></div>
<section id="dont-remove-me-please" contenteditable="false">DONT' REMOVE ME!!!</section>
<div><br></div>
</div>
<script>
document.getElementById('editor').focus()
</script>
</body>
</html>
Thank You.
You can set contenteditable=false to children to prevent them from being editable.
However if you still want the children to be editable but the child dom elements shouldn't be removable I think you need to listen to backspace/delete events and see how these effect the dom and undo the changes if they remove dom nodes. Trying to figure this out myself
Edit: this is what I did
function onpaste(e: ClipboardEvent) {
e.preventDefault();
const selection = window.getSelection();
// Don't allow deleting nodes
if (selection.anchorNode.isSameNode(selection.focusNode)) {
// get text representation of clipboard
const text = e.clipboardData.getData("text/plain");
// insert text manually, but without new line characters as can't support <br/>s yet
document.execCommand("insertHTML", false, text.replace(/\n/g, ""));
}
}
function onkeydownInEditable(e: KeyboardEvent) {
if (e.key === "Enter") {
e.preventDefault();
}
if (e.key === "Backspace" || e.key === "Delete" || e.key === "Paste") {
const selection = window.getSelection();
// Don't allow deleting nodes
if (!selection.anchorNode.isSameNode(selection.focusNode))
e.preventDefault();
}
}
elementEditing.addEventListener("keydown", onkeydownInEditable);
elementEditing.addEventListener("paste", onpaste);
To achieve expected result, use below click event listener and add contenteditable attribute based on id
<script>
document.getElementById('editor').addEventListener('click', function(e) {
if(e.target.id !=="dont-remove-me-please"){
e.target.setAttribute("contentEditable", true);
}
}, false);
</script>
code sample - https://codesandbox.io/s/rypy7wkn5m
<html>
<head>
<title>Parcel Sandbox</title>
<meta charset="UTF-8" />
<style>
#editor {
width: 100%;
height: 300px;
border: 1px black solid;
}
#dont-remove-me-please{
width: 100%;
height: 100px;
border: 1px red dashed;
font-weight: bold;
user-select: none;
}
</style>
</head>
<body>
<div id="app"></div>
<div id="editor">
<div>hey guys!</div>
<div><strong>more text...</strong></div>
<section id="dont-remove-me-please" contenteditable="false">DONT' REMOVE ME!!!</section>
<div><br></div>
</div>
<script>
document.getElementById('editor').focus()
</script>
<script>
document.getElementById('editor').addEventListener('click', function(e) {
if(e.target.id !=="dont-remove-me-please"){
e.target.setAttribute("contentEditable", true);
}
}, false);
</script>
</body>
</html>
In this code i change the color of my div while hovering the mouse over it. How can i achieve this without using style and instead put it in a script with namespace?
<html>
<head>
<title></title>
<style type="text/css">
.link-container {
border: 1px solid;
width: 50%;
height: 20px;
}
.link-container a {
display: block;
background: green;
height: 100%;
text-align: center;
}
.link-container a:hover {
background: red;
}
</style>
</head>
<body>
<div class="link-container">
<a>hover to change color</a>
</div>
</body>
</html>
You can use mouseover event of the element.
[].forEach.call(document.getElementsByClassName('link-container'),function(e){
e.addEventListener("mouseover", function(){
this.style.background='red'
});
});
EDIT:
You need mouseout event to remove the applied style.
[].forEach.call(document.getElementsByClassName('link-container'),function(e){
e.addEventListener("mouseover", function(){
this.style.background='red'
});
e.addEventListener("mouseout", function(){
this.style.background='inherit'
});
})
add eventListeners and have then fire functions in your namespace (say myApp)
var myApp = {
hover: function(event){
event.target.setAttribute("style", "background-color:red;")
},
out: function(event){
event.target.setAttribute("style", "background-color:green;")
}
}
var item = document.getElementById("btn");
item.addEventListener("mouseover", myApp.hover, false);
item.addEventListener("mouseout", myApp.out, false);
Plunker here
This question already has answers here:
why javascript this.style[property] return an empty string? [duplicate]
(2 answers)
Closed 6 years ago.
Hi there I'm having a problem. I made a box of blue color in HTML/CSS and want javascript to alert the name of color when the box is clicked. Here is my code.`
var clr = document.getElementById("box").style.backgroundColor;
document.getElementById("box").onclick= function() {
alert(clr);
}
<!DOCTYPE html>
<html>
<head>
<title>
</title>
<style>
#box {
height: 100px;
width: 100px;
background-color: blue;
margin: 0px;
display: inline-block;
}
</style>
</head>
<body>
<div id="box" class="box">
</div>
</body>
</html>
You need to use getComputedStyle(). .style is use to set a new value for target element.
var div = document.getElementById("box"), // element
divCSS = window.getComputedStyle(div), // element CSS
bgColor = divCSS.getPropertyValue('background-color'); // property
document.getElementById("box").onclick= function() {
alert(bgColor);
}
#box{
height: 100px;
width: 100px;
background-color: blue;
margin: 0px;
display: inline-block;
}
<div id="box" class="box"></div>
Here is the working code
<!DOCTYPE html>
<html>
<head>
<title>
</title>
<style>
#box {
height: 100px;
width: 100px;
background-color: blue;
margin: 0px;
display: inline-block;
}
</style>
</head>
<body>
<div id="box" class="box">
</div>
</body>
</html>
<script>
/* var clr = document.getElementById("box").style.backgroundColor;*/
document.getElementById("box").onclick= function() {
var ele = document.getElementById("box");
var style = window.getComputedStyle(ele);
var bColor = style.getPropertyValue("background-color");
alert(bColor);
}
</script>
This works
var clr = document.getElementById("box").style.backgroundColor;
document.getElementById("box").onclick= function() {
alert(clr);
}
<!DOCTYPE html>
<html>
<head>
<title>
</title>
</head>
<body>
<div id="box" class="box" style="height: 100px;width: 100px;background-color: blue;margin: 0px;display: inline-block;"></div>
</body>
</html>
You can also use below code with provided html
<script>
var clr= window.getComputedStyle(document.getElementById("box")).getPropertyValue('background-color'); // property
document.getElementById("box").onclick= function() {
alert(clr);
}
</script>
Try using the variable clr inside the function.
Also invoke the fucntion using onclick on the div itself.
Using regex to get the property backgorund color in whole css.
You can also use filter on #box using
var boxCss = clr.match(/#box{((.*\s*.*)*)}/g);
<!DOCTYPE html>
<html>
<head>
<title>
</title>
<script>
function colorAlert() {
var clr = document.getElementsByTagName("style")[0].innerHTML;
var res = clr.match(/background-color:.*;/g);
alert(res[0]);
}
</script>
<style>
#box{
height: 100px;
width: 100px;
background-color: blue;
margin: 0px;
display: inline-block;
}
</style>
</head>
<body>
<div id="box" class="box" onclick="colorAlert();">
</div>
</body>
</html>
You have two ways to solve this :
keep <script> tag after after closing <div> tag
move clr var in side the onclick function,then you can write <script> tag where ever you want
I need to have text underneath the circle when I hover over it. I have to use html, css and javascript. I'm not that good with javascript so I know thats the problem. Any help would be appreciated and if there is a simpler way to do the javascript code that would be good too!
Here is my html code:
<!DOCTYPE html>
<html>
<head>
<link type="text/css" rel="stylesheet" href="style.css"/>
<script type="text/javascript" src="main.js"></script>
</head>
<body>
<p>I often scribble in the sand</p>
<p>The words I find so hard to say</p>
<p>And hope the wind will come along</p>
<p>And blow them all your way.</p>
<div data-bind="event: { mouseover: EnableDetails, mouseout: DisableDetails
}"></div>
<p data-bind="visible: DetailsViewable(), text: AuthorName"></p>
</body>
</html>
here is my css code
div {
display: inline-block;
margin-left: 5px;
height: 100px;
width: 100px;
border-radius: 100%;
border:2px solid black;
background-color: black;
}
here is my javascript code:
var ViewModel = function() {
var self = this;
self.AuthorFirstName = ko.observable("Joe");
self.AuthorLastName = ko.observable("Blow");
self.AuthorName = ko.computed(function(){
return self.AuthorFirstName() + " " + self.AuthorLastName();
});
self.DetailsViewable = ko.observable(false);
self.EnableDetails = function() {
self.DetailsViewable(true);
};
self.DisableDetails = function() {
self.DetailsViewable(false);
};
};
var viewModel = new ViewModel();
ko.applyBindings(viewModel);
You can do this all with CSS.
http://jsfiddle.net/hzpKu/
div {
display: inline-block;
margin-left: 5px;
height: 100px;
width: 100px;
border-radius: 100%;
border:2px solid black;
background-color: black;
}
div:hover + p {
display:block;
}
p {
display:none;
}
Why not try with Jquery? is more easy with it.
http://jquery.com
(just download the plug in and put in the header)
<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<style>
div {
display: inline-block;
margin-left: 5px;
height: 100px;
width: 100px;
border-radius: 100%;
border:2px solid black;
background-color: black;
}
</style>
</head>
<body>
<p>I often scribble in the sand</p>
<p>The words I find so hard to say</p>
<p>And hope the wind will come along</p>
<p>And blow them all your way.</p>
<div id="circle"></div>
<p id="circle_text"></p>
<script>
$( "#circle" ).hover(function() {
$("#circle_text").text("Joe Blow");
}, function() {
$("#circle_text").text( "" );
});
</script>
</body>
</html>
You can also try something like this with a little bit of jquery...
Live Demo
<div id="circle"></div>
<div id="text">
...
</div>
$('#circle').on('mouseenter', function () {
$('#text').show("slow");
});
$('#circle').on('mouseout', function () {
$('#text').hide("slow");
});
Updated:
or you can do it with less code by using hover and toggle
$('#circle').hover( function () {
$('#text').toggle("slow");
});
Live Demo 2